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Browse Prior Art Database

INK JET ELECTROSTRICTIVE EXCITER MATERIALS

IP.com Disclosure Number: IPCOM000024809D
Original Publication Date: 1982-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 92K

Publishing Venue

Xerox Disclosure Journal

Abstract

Ink jet printing has been performed using a number of different printing archi-tectures. One type of printing known as continuous or Raleigh-type printing uses an ink droplet generator which continuously directs a stream of droplets toward a printing medium. Ink squirted from an orifice in the drop generator forms an ink column which breaks up into individual droplets. Selected droplets are caught by a gutter and recirculated back to the droplet generator while others pass un-obstructed to the printing medium. In order to control the trajectory of the ink droplets, a charge is induced on selected ones of those droplets as they form in the vicinity of a charging electrode. Control over the point of droplet breakoff is necessary if the charging step is to be accurately performed. The size of those droplets, as well as, the point of droplet location is controlled using one of a number of droplet excitation devices.

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XEROX DISCLOSURE JOURNAL

INK JET ELECTROSTRICTIVE EXCITER MATERIALS U.S. Cl. 346/75
Doyle

Proposed Classification

3 P. Skinner Int. C1. Gold 15/18

Ink jet printing has been performed using a number of different printing archi- tectures. One type of printing known as continuous or Raleigh-type printing uses an ink droplet generator which continuously directs a stream of droplets toward a printing medium. Ink squirted from an orifice in the drop generator forms an ink column which breaks up into individual droplets. Selected droplets are caught by a gutter and recirculated back to the droplet generator while others pass un- obstructed to the printing medium. In order to control the trajectory of the ink droplets, a charge is induced on selected ones of those droplets as they form in the vicinity of a charging electrode. Control over the point of droplet breakoff is necessary if the charging step is to be accurately performed. The size of those droplets, as well as, the point of droplet location is controlled using one of a number of droplet excitation devices.

One droplet breakpff control technique couples ink inside the droplet generator to a piezoelectric crystal which converts electrical signals to motion thereby setting up pressure waves in the ink which, in turn, causes droplets to break off the ink column at a definite location in relation to the droplet charging electrode. In designing ink printing systems using such droplet exciters, one goal is to increase the efficiency of the exciters in setting up the pressure waves. Using droplet generator geometries designed to put the output from piezoelectric crystals to maximum use has been one tactic taken to optimize exciter efficiency.

The...